Pin Pixi to 8.18.1 (fixes BatcherPipe null-geometry crash)

tiny.js floated to `pixi.js@8` (latest), which resolved to 8.19.0. Its
"Container.updateTransform honors zero scale" render change crashes the chunked
map's batcher ("Cannot read properties of null (reading 'geometry')") — only on
tiny-army (8.19.0), never on auto-battler (pinned 8.18.1). Pin to 8.18.1 so the
Space runs the exact Pixi the bundles are built/tested against.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/tiny.js

@@ -3,7 +3,11 @@
 // convention come from the SAME shared source as the auto-battler
 // (src/render/spriteSheet.js → /web/sheet.js). Pixi is injected (CDN) so there's
 // one Pixi instance.
-import * as PIXI from 'https://cdn.jsdelivr.net/npm/pixi.js@8/dist/pixi.min.mjs'
+// PINNED to 8.18.1 — the exact Pixi the auto-battler app is built/tested against. Floating to
+// `@8` (latest) pulled 8.19.0, whose "updateTransform honors zero scale" render change crashes the
+// chunked map's batcher ("Cannot read properties of null (reading 'geometry')"). Keep in lockstep
+// with auto-battler/package.json's pixi.js version.
+import * as PIXI from 'https://cdn.jsdelivr.net/npm/pixi.js@8.18.1/dist/pixi.min.mjs'
 import { mountSpritePlayground } from '/web/playground.js'
 import { mountClassesSandbox } from '/web/classesSandbox.js'
 import { mountEnemiesSandbox } from '/web/enemiesSandbox.js'